Documentation and changlog for release 2.3.0

[ianroberts]

• Changelog entry for 2.3.0
• Versioned documentation

[github-actions]

Jest Coverage

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	83.83	83.17	64	83.83

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	83.83	83.17	64	83.83
_jrpc	94.11	91.66	83.33	94.11
_ index.js	94.11	91.66	83.33	94.11	29-30,38-40
_utils	82	82.1	57.89	82
_ annotations.js	97.75	70.83	100	97.75	35-36
_ dict.js	88.88	83.33	100	88.88	3-4
_ expressions.js	80.08	82.35	80	80.08	...,188-190,201-218
_ index.js	73.6	100	14.28	73.6	...4-65,76-82,93-94